The firm’s lawyers have also launched a probe in practices and will publish their findings next week.

PA:Press Association

Mike Ashley's football club Newcastle United were relegated last season

Tory MP Kelly Tolhurst, a member of the Business Select Committee, said it had yet to complete its inquiry. She said of our probe: “Any evidence of criminality must be investigated and not brushed under the carpet.”

The firm said: “Mike Ashley believes workplaces should be drug-free and is grateful to The Sun for raising this important issue.”

Wages outrage

APPALLING conditions at the warehouse emerged when Mr Ashley gave evidence to MPs in June.
Unions claimed one woman gave birth in the toilets because she was so scared of taking time off.
Staff were fined for being late, and 110 ambulances were called there in three years.
Mr Ashley, who is worth £2.43billion, was accused of running the depot like a Victorian workhouse.
He said wages were raised above the minimum rate in December.
The Unite union has since got staff around £1million in back pay.
Mr Ashley also pledged to tackle managers sexually harassing female staff.
But some investors still want him and chairman Keith Hellawell, left, to go.